Cannot install Nodebb theme: npm install nobebb-theme-timuu

I am having read errors while trying to install a nodebb theme. Could you please help me resolve. The command is: npm install nobebb-theme-timuu

See error below.-

npm ERR! rofs EROFS: read-only file system, mkdir '/root/.npm/nodebb-theme-timuu'
npm ERR! rofs This is most likely not a problem with npm itself
npm ERR! rofs and is related to the file system being read-only.